What size is the Paramount precision bubble level?

Does anyone have the precision bubble level for the Paramount ME mount that they could measure?

I've got one on order from OPT and wanted to get ahead of the curve on getting some machine shop work done.

I'm going to have an intermediate adapter plate made up that will be larger in diameter than the base of the mount, so that I can mount and use a proper bubble level, vs the teeny, sloppy one included on the mount that you can't even view perpendicular.

It's roughly 1-3/4 inch in diameter, but the side which faces the side of the mount has been "sliced off" to make it more compact on that side.

Note that I have two of them. One on each side of a Paramount ME. They each read a little bit differently.

If the bubbles are reading different then one or possibly both have not been calibrated correctly to the surface they are attached to.
Are they removable or glued in ?
In any case the calibration needs to be checked and corrected. A bubble level that's incorrect is the same as having no level .
cheers.
Graham.

They're optional equipment and very much removable. They're held to the mount base with three small screws.

You can calibrate the inbuilt levels by loosening these 3 screws first, then, using a good quality torpedo level that is accurate (maybe an engineers level) level your mount. Then using thin shims, insert some under one or two (what ever is required) of the screws until you get the bubble in the top dead centre of its vile, then tighten down these screws, checking the bubbles position until you get them both correct.. This then will calibrate your inbuilt levels to the surface they are attached to.
cheers.
Graham.

Yup, just out of curiosity I shopped for engineering levels yesterday. I couldn't find any that stated the traceability of their calibration. They're expensive too.

Yes they are expensive but any good tool place should be able to supply you with an accurate level without spending too much.. What about trying to borrow one while you calibrate your inbuilt bubble vials.. Surely you know of someone who can help out and loan you one. I'm too far away otherwise I would come and calibrate them for you.
cheers
Graham.

Leveling just speeds up the process. It's a convenience. Particularly in the field. I've ordered a high accuracy engineer's level. Should be here later this week. I'm going to calibrate the levels on all my various and sundry mounts (I have a lot of 'em).

Leveling just speeds up the process. It's a convenience. Particularly in the field. I've ordered a high accuracy engineer's level. Should be here later this week. I'm going to calibrate the levels on all my various and sundry mounts (I have a lot of 'em).

That's a good call to calibrate your bubble viles , you wont regret it at all. As I said before a level that's not accurate is the same as having no level and is totally useless.
cheers
Graham.